Speaker
Description
The near-infrared Ks-band is essential for studying low surface brightness (LSB) structures, as it traces older stellar populations and offers valuable insights into the early Universe. Observing in this band is particularly important for faint galaxies with evolved stellar populations or significant dust extinction. VISTA, the largest near-infrared survey telescope, plays a crucial role in bridging the gap between infrared datasets such as Euclid (YJH bands) and Spitzer/WISE ($ > 3.6\ \mu m$), providing essential K-band coverage for comprehensive studies.
Our research introduces NASIM, a fully automated data reduction pipeline optimized for preserving LSB structures in VISTA/VIRCAM data. Built using the powerful GNU Astronomy Utilities (Gnuastro), NASIM addresses challenges such as large flat patterns and complex detector signatures, implementing a non-aggressive sky subtraction method to preserve faint features. This makes it ideal for LSB studies, especially those focusing on faint galaxies and ultra-diffuse structures, where conventional reduction methods often struggle.
In this presentation, we showcase our analysis of faint galaxies in the Euclid Deep Field South (EDFS), a key LSST deep drilling field, using NASIM. Through a multi-wavelength study focused on the Ks-band, we offer new insights into the properties of faint galaxies, deepening our understanding of galaxy formation and evolution in the low-mass regime. Our study emphasizes the analysis of surface brightness profiles, stellar ages, metallicity, and total stellar mass, providing a clearer picture of these challenging systems.
